Numerical investigation of residual stress in plasma sprayed antifriction wear-resistant sealing coatings on GH4169 superalloy substrate

• Published in: Materials today communications Vol. 31; p. 103595
• Main Authors: Wang, Jie, Zhang, Yanchao, Cui, Yahui, Zhai, Zhaoyang, Chen, Lingping, Lu, Junwen
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.06.2022
• Subjects: Antifriction wear-resistant sealing coating; Residual stress; Structural parameter optimum; Thermomechanical coupling; Antifriction wear-resistant sealing coating; Structural parameter optimum; Thermomechanical coupling; Residual stress
• ISSN: 2352-4928; 2352-4928
• DOI: 10.1016/j.mtcomm.2022.103595

Spraying an antifriction wear-resistant sealing coating (AWSC) on the rotor track is an ideal way to improve wear resistance of finger seal. In this paper, spraying the bond coating (BC) and the AWSC on the substrate (SUB) was simulated, and the numerical model of the AWSC system with plasma spraying was established by using ABAQUS finite element software during the spray deposition by thermal-structure direct coupling, in which the variations of thermophysical parameters of materials with temperature were considered, and the influence of BC thickness, AWSC thickness and the ratio of thickness parameters between BC and AWSC on the residual stress of the AWSC system was studied. The results showed that the radial stress at the SUB/BC interface gradually changes from compressive stress to tensile stress with the increase of radial distance while the radial stress at the BC/AWSC interface is compressive stress completely and the radial stress on the AWSC surface gradually changes from compressive stress to around zero. Coating thickness has little effect on the axial stress while shear stress increases and radial compressive stress decreases as coating thickness increases at the interfaces and on the AWSC surface. There are greater stress mutations at 0.5 mm from the edge than those at other positions in the edge area. When the thickness ratio of BC to AWSC is controlled at 2:3, the AWSC system can get optimal stress variation and mitigation effects. By reasonably regulating the structural parameters, the residual stress and stress mutation of the AWSC system can be further reduced and the bonding strength between SUB and BC as well as between BC and AWSC can be improved provided that the BC thickness Tb = 0.10 mm and the AWSC thickness Tc = 0.15 mm. This work can provide a guidance for preparation of the AWSC system used for finger seal experiment. [Display omitted]